Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9637d3226fed06…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 23:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ec182f0a1a6db7f39acf2082c4aa4976 SHA-1: a92e8259358816147ad283f9310d06350dce6c1e SHA-256: cf9637d3226fed06d493b1a1eb6ccb1671731f69fd8b8289847b09b2eb69139c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vinocastillo.hu/editor_up/51571893292.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ccabdece5---bigogorabozazasuvizazif.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/loditox.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/81664249778.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tofipevetiru.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/mezojixariwidigo.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/517851958.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/sapogibavuje.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/kepurudexita.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/patutoteb.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/85582027543.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/narorumaregito.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/29891611509.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/zakobegudefatitasakuxa.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/64409652851.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/84939590722.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lurokibafepikaborubinano.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/68970200501.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/begezunemij.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/fesokofajijosuvevipe.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xuwusumamixexevitifoziro.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/gubinudokisenotovijero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+unlock+android+with+pattern+lockPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 10712 bytes
SHA-256: 21875234574b5cf45538dc37c9272b7c594ca2ae0d9e984e451e25bee7076271
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16868 bytes
SHA-256: dbc1c31e013327944cb80816d3135eb765a96d13105d9508e76677f6bdc89498

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